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Lets put it this way any CZ is a good CZ and could write a book on them using every model ever made....some several different ones of a particuliar model..Perhaps I am old school but give me a conventional CZ any day versus the CZ3D but again years ago when I travelled and hunted 150 year old areas perhaps a CZ3D would be my choice..
Where the 3D has an advantage, is in older sites where you are strictly looking for older coins and do not want to dig a lot or trash. Some older coins will hit as mid tone on a CZ5, where they will hit as high tone on a 3D.
As far as depth, soil conditions ( both mineralization and what is in the ground target wise) play the major role, so if there is a CZ5 and CZ3D tuned/calibrated correctly, in the same conditions, they both should have the same capabilities.
The main difference is the 4th tone on the 3D and how it ID's certain coins.
So if you will be digging ALL mid and high tone targets, it does not matter what unit you have.
The only thing I can see is the 3D puts all of the odd ball coins in the high tones, other than that the CZ5 is just as capable because I'm going to dig the square tab signals anyways and that is where most of the odd ball coins are going to hit on the CZ5. Coins like the 3 cent nickel hit on square tab
and you can bet if I'm in an old area those signals will get dug. It is just preference to a certain CZ detector because they all hit hard and deep on targets......HH
To answer to question, all CZs in salt mode are as close to the same as you can get, all other things equal. Variations are there within the same models, but I don't know that there is any difference by type. CZ5s = CZ7aPros=CZ21s allowing that among CZ5s, etc some are stronger than others as long as we are in Salt Mode.
Tom
